World Wars I and II were two large-scale conflicts that changed the world order and had an impact on human history. The importance of this war lies not only in the final outcome of the conflict, but also in its social, political, and economic impact in many countries. One of the main interests of World War I was the creation of international organizations, such as the League of Nations. Founded after the war to prevent similar conflicts in the future, the League became the forerunner of the United Nations. This effort shows the importance of diplomacy and international cooperation in maintaining peace. World War II gave rise to deeper tensions, sparking the formation of two superpowers: the United States and the Soviet Union. The ideological competition between capitalism and communism changed the geopolitical map of the world. The cold war that followed presented an unarmed conflict that affected many countries, including Indonesia, which was then struggling for independence. From an economic perspective, the two world wars provided a boost to industry. In World War I, many countries experienced increased production of weapons and military equipment. This triggers technological innovation, such as in the fields of transportation and communications. Meanwhile, World War II accelerated the use of new technology, including radar and the atomic bomb. These developments had a major impact on industry in the post-war period. The war also brought about massive social changes. World War I marked the entry of women into the workforce more broadly. With many men away at war, women took over many of the jobs, ultimately contributing to the women’s rights movement. Meanwhile, World War II emphasized the role of women in the armed forces. The bitter experiences of war and atrocities, such as the Holocaust, awaken humanity to the dangers of extremism. This has led to increased global attention to human rights. The Universal Declaration of Human Rights in 1948 became an important foundation for the protection of human rights throughout the world. The importance of the World Wars in human history is a stark reminder of the enormous impact of large-scale conflict. Experience from both wars shows that international cooperation and a shift in social paradigms are essential to building peace. In addition, lessons learned from past mistakes continue to provide a reference for future foreign policy and global security strategies. To summarize, the impact of World Wars I and II continues to shape the character of the modern world. A deep understanding of the importance of this conflict is important for future generations to avoid repeating the same mistakes and to achieve a more peaceful and just world.